Explore topic-wise MCQs in Fluid Mechanics.

This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.

1.

If the side slope angle in a trapezoidal section is 45° and it discharges to the maximize extent, calculate the top width of the channel section. Given: y = 4m

A. 10.31m
B. 11.31m
C. 12.31m
D. 13.31m
Answer» C. 12.31m
Discussion
2.

The maximum discharge through the trapezoidal channel is 20 m3/s and the velocity of flow is 5 m/s. Calculate the base width of the channel if the side slope is 1H:4V.

A. 3.31m
B. 2.31m
C. 1.31m
D. 0.31m
Answer» C. 1.31m
Discussion
3.

Calculate the maximum discharge through a trapezoidal channel if the wetted perimeter is 6.24m, side slope of 1H:2V and base width of 4m. Given: C=55 and S0=1/1500.

A. 3.52 m3/s
B. 4.52 m3/s
C. 5.52 m3/s
D. 6.52 m3/s
Answer» C. 5.52 m3/s
Discussion
4.

The wetted perimeter of the most economical trapezoidal section is 7.47m, the base width is 3m and has the side slope of 1H:2V.

A. 1m
B. 2m
C. 3m
D. 4m
Answer» C. 3m
Discussion
5.

Calculate the depth of the most economical trapezoidal channel section having wetted area equal to 50m2 and the side slope of 1H:5V.

A. 3.21m
B. 4.21m
C. 5.21m
D. 6.21m
Answer» D. 6.21m
Discussion
6.

The wetted area of a most economical trapezoidal section is 21.58m2, base width of 5m and side slope of 1H:3V. Calculate the maximum discharge through the channel if the C=60 and S0=1/500.

A. 56.32 m3/ s
B. 66.32 m3/ s
C. 76.32 m3/ s
D. 86.32 m3/ s
Answer» D. 86.32 m3/ s
Discussion
7.

THE_WETTED_PERIMETER_OF_THE_MOST_ECONOMICAL_TRAPEZOIDAL_SECTION_IS_7.47M,_THE_BASE_WIDTH_IS_3M_AND_HAS_THE_SIDE_SLOPE_OF_1H:2V.?$

A. 1m
B. 2m
C. 3m
D. 4m
Answer» C. 3m
Discussion
8.

The maximum discharge through the trapezoidal channel is 20 m3/s and the velocity of flow is 5 m/s. Calculate the base width of the channel if the side slope is 1H:4V.$

A. 3.31m
B. 2.31m
C. 1.31m
D. 0.31m
Answer» C. 1.31m
Discussion
9.

Calculate the maximum discharge through a trapezoidal channel if the wetted perimeter is 6.24m, side slope of 1H:2V and base width of 4m. Given: C=55 and S0=1/1500.$

A. 3.52 m<sup>3</sup>/s
B. 4.52 m<sup>3</sup>/s
C. 5.52 m<sup>3</sup>/s
D. 6.52 m<sup>3</sup>/s
Answer» C. 5.52 m<sup>3</sup>/s
Discussion
10.

If the side slope angle in a trapezoidal section is 45° and it discharges to the maximize extent, calculate the top width of the channel section. Given: y = 4m$

A. 10.31m
B. 11.31m
C. 12.31m
D. 13.31m
Answer» C. 12.31m
Discussion
11.

Calculate the maximum discharge through a trapezoidal channel if the depth is 5m.

A. 56.67 m<sup>3</sup>/s
B. 66.67 m<sup>3</sup>/s
C. 76.67 m<sup>3</sup>/s
D. 86.67 m<sup>3</sup>/s
Answer» E.
Discussion
12.

What is the angle made by the sloping side when the trapezoidal channel discharges to the maximum extent?

A. 30°
B. 45°
C. 60°
D. 90°
Answer» D. 90¬¨¬®‚Äö√†√ª
Discussion
13.

Calculate the depth of the most economical trapezoidal channel section having wetted area equal to 50m2 and the side slope of 1H:5V?

A. 3.21m
B. 4.21m
C. 5.21m
D. 6.21m
Answer» D. 6.21m
Discussion
14.

The wetted area of a most economical trapezoidal section is 21.58m2, base width of 5m and side slope of 1H:3V. Calculate the maximum discharge through the channel if the C=60 and S0=1/500.

A. 56.32 m<sup>3</sup>/ s
B. 66.32 m<sup>3</sup>/ s
C. 76.32 m<sup>3</sup>/ s
D. 86.32 m<sup>3</sup>/ s
Answer» D. 86.32 m<sup>3</sup>/ s
Discussion
15.

Calculate the maximum discharge through a trapezoidal section having depth 3m, side slope 1H:4V and bed slope of 1 in 2000. Given: n = 0.025.

A. 19.09 m<sup>3</sup>/s
B. 20.09 m<sup>3</sup>/s
C. 21.09 m<sup>3</sup>/s
D. 22.09 m<sup>3</sup>/s
Answer» B. 20.09 m<sup>3</sup>/s
Discussion
16.

The base of the most economical trapezoidal channel section is 6m and the side slope is 1H:2V, calculate the maximum discharge through the channel if the bed slope is 1 in 1000 and C = 50.

A. 120.61 m<sup>3</sup>/s
B. 110.61 m<sup>3</sup>/s
C. 100.61 m<sup>3</sup>/s
D. 90.61 m<sup>3</sup>/s
Answer» D. 90.61 m<sup>3</sup>/s
Discussion
17.

The top width of a most economical trapezoidal channel section is 8m, determine the hydraulic radius of the channel if the side slope is 1H:3V.

A. 1.8m
B. 1.9m
C. 2.0m
D. 2.1m
Answer» C. 2.0m
Discussion
18.

The top width of a most economical trapezoidal channel section is 7m and the side slope of the channel is 1H:2V, determine the depth of the channel section.

A. 2.13m
B. 3.13m
C. 4.13m
D. 5.13m
Answer» C. 4.13m
Discussion
19.

Estimate the hydraulic radius of the most economical trapezoidal channel section having depth y and side slope Z.

A. <sup>y</sup>‚ÅÑ<sub>2</sub>
B. y
C. 2y
D. 3y
Answer» B. y
Discussion